Here it is a resume about burning TOS roms. When I receive my EEPROMs I will make a visual one adding screenshots as examples

About TOS burning EPROMS/EEPROMS:Atari STFM: 6 ROM EPROMs needed: 27C256 x6 (200 or less speed. 150 recommended).Be sure they are erased or erase them using an UV Eprom eraser (40 min.).EPROM Programmer (like Willem)TOS 1.4 (or other but it has to be lower than 1.6)You can load the image in this program and split it in 6 parts as you can see: http://atari.8bitchip.info/astopensw.php (ROMSPLIT.ZIP)Burn the eproms using your burn program (windows?) Plug them in the ST as it is indicated in attached file:

Using Flash ROMs is the same but you need 29C256' 32kx8 ATMEL (28pin) FLASH ROMS instead of 27C256 ones. This options is better because flash roms are newer technology.

Atari STe and Mega STe2 ROMSEPROMs needed: 27C010 x2 (less than 200 speed. 120-150 recommended)Be sure that the eproms are erased. You can erase them using an UV Eprom eraser (40 min.)EPROM ProgrammerTOS 1.62 or 2.06 (or other but it has to be 1.6X or 2.XX)You can load the image in this program and split it in 2 parts as you can seehttp://atari.8bitchip.info/astopensw.php (ROMSPLIT.ZIP). In TOS 2.06 it is necessary to check to correct CRC ROMsBurn the eproms using your usual program (winHex?)

In an Ste HI/LO is located as follows:HI|LODon't forget you have to configure some jumpers

In a MegaSTe HI/LO is located as follows:HI - LOUsing Flash ROMs is the same but you need '29F010' 128k x 8 FLASH ROMS instead of 27C010 ones. This option is better because EEPROMS are newer than EPROMS.

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I will try later to write about multitos. I am searching around Atari-Forum posts and collecting info EEPROMs needed,hardware mod (switch) or can be by a prg in a floppy disk that ables you to change TOS?

But now I am not able (not enough knowledge) about making custom TOS in a STfm and STe...

This is all interesting stuff. I recently took it upon myself to source and digest information on the net about TOS v2.06 burning, and Atari ST ROM burning in general.

There seems to be little Information about compatibility and hardware modification requirements of TOS v2.06 ROMS and v1.62 ROMS for an Atari STFM system - how is it possible to get these ROMS to work on an Atari STFM?

Maybe of some help for people. I have got a few EPROM to STFM boards coming this week if anyone wants one they are in my store. I have not got many made as I only really needed a couple myself and no interest from anyone else.

Hi! i have an Atari 1040STfm with TOS 1.02. My motherboard has 6 sockets for 28 pins chips, but only 2 chips by SHARP. I bought from Ebay UK 2 chips eproms 32pins with TOS 1.04, what i can do to fit them on my Atari? i think that i must do this that exxos told! this is the same as exxos site? i mean cable connections on eproms. http://www.adsb.co.uk/bbc/adaptor.html and some photos from mine ST.

one thing to note here, you have to fit the eproms direct into the sockets (hardware only) otherwise the ST metalwork will not sit flush, and this could prevent you from screwing the case back together and even cause the keyboard to be at the wrong angle. Note the metalwork rests directly ontop of the first TOS chip towards the edge of the board. So any additional sockets or such will cause a problem. While my TOS adapter PCB is a simple plugin, you will not be able to reassemble back into the ST case. So doing the wiring direct on the chip as I show on my pages is the only other "easy" solution.

I have an Atari STe with spanish TOS 1.62. This version can't be found on internet (I haven't found it). If anyone is interested, I can send the .bin files (I do not know how to merge them to make it work on hatari or steem).

exxos wrote:one thing to note here, you have to fit the eproms direct into the sockets (hardware only) otherwise the ST metalwork will not sit flush, and this could prevent you from screwing the case back together and even cause the keyboard to be at the wrong angle. Note the metalwork rests directly ontop of the first TOS chip towards the edge of the board. So any additional sockets or such will cause a problem. While my TOS adapter PCB is a simple plugin, you will not be able to reassemble back into the ST case. So doing the wiring direct on the chip as I show on my pages is the only other "easy" solution.

So, if I have an Atari Mega 4 with german 1.4 TOS and I want to replace it for an spanish 1.4 TOS I have to do this soldering stuff, is that right? isn't there any 28 pin compatible EPROM that can handle this update?

About the rom image... Do I have only to split the 1.4 spanish TOS .img file into two files? like with the 1.62 TOS?

Mega 4b.jpg

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Last edited by qq1975b on Fri Mar 29, 2013 7:58 pm, edited 1 time in total.

Yes, I am asking here only about the TOS ROMS. I still have the idea of writing a guide about TOS upgrade...but these 2x 28 PIN...it seems to me that it won't be so easy if there is not any 28 pin compatible eprom or eeprom It will only be possible through adapters or making that soldering bridges...is that right?

By the way...does anybody know where I can find (if it exists) the Atari TOS 2.06 and 3.06 Spanish?

EDIT: 1.62 spanish TOS uploaded again in a previous post with the PAL patched version.

By the way...is there a more or less simple way to translate a TOS rom? I mean, I have TOS 3.05 spanish...but there isn't a 3.06 one. Can I get the UK 3.06 and translate it to Spanish using 3.05 spanish rom code?

I have tried to do it for my Mega 4 but I only achieve a white screen with slightly yellow borders.

I have done the following:

TOS 1.04SP burnt in 2 27C010 EPROMS. The original TOS .IMG file had been splitted in two files (HI and LO) using Hatari and Ppera ROMSPLIT.Because it will be in a Mega ST and there is lot of free space I have used two 32 PIN socket per chip. So the images are here:

Mega 4 orignal roms (1.04 German)

IMG_1029.JPG

Sockets modded:

IMG_1031.JPG

IMG_1032.JPG

But it doesn't work....What I have done wrong???

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Yes, 27C010 are fine, but there are no 28pin 1MBit EPROMs, just PROMS (Atari) as the EPROMs need more pins for programming purposes. Like 12.5V programming voltage.If you want to put a TOS1.04 into two 32pin EPROMs you will need some kind of PCB adaptor. Take the schematics of your Mega ST and the datasheet of a 27C010. Compare the pinout. Either you design your own PCB or you may use wiring.